Starting mechanism for multicylinder internal-combustion engines.



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STARTING MECHANTSM TOR MULTTCYLINDER INTERNAL CoMBusTloN ENGINES.

-MPLICATlN FILED FEIT-17.1915.

Patented Jan. 16, 1917.

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Witnesses -To ullwhom it may concern f UNITED 'STATES PATENT OFFICE.

OSKAR LSOHE. OF CHARLOTTENBURG, GERMANY, ASSIGNOR TOGENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK.

STARTINGMECHANISM For. MULTICYLINDER I'NTERNALCOMBDUSTION ENGINES.

Application filed February 17, 1915. Serial No. 8,718.

Be it known that I, Osiian Inscris, a subject of the King of Saxony,residing at Charlottenburg, Germany, have invented certain `new anduseful Improvements in Starting Mechanism for MulticylinderInternal-Combustion Engines, 'ot which the following is a specification.

-The present invention relates to multicylinder internal combustionengines of the high compression type, in which the scavenging orcharging air is furnished by a suitable pump driven by the engine.

The object of the invention is to provide an improved arrangel'nent forstarting such engines.

For a consideration of what I believe to` be novel and my invention,attention isy directed to the accompanying description and the claimsappended thereto.

I the accompanying drawing Figure 1 a longitudinal section of amulti-cylinder combustion engine; Fig. 2 is a cross-section on the line.Q -2, IVig. 1; Fig. 3 is 'a top plan View, and Fig. 4 shows amodication.

The Working cylinders 1, 2, 3 and 4 each contain two opp'ositely movingpistons 5, G, which act on the same crank shaft,-the' upper pistonscontrolling the exhaust ports and the lower pistons the scavenging orair charging ports 8, to which air isadmitted from the receiver 9. Thescavenging pump 10 delivers air into the receiver 9 through the valvesI11. A

The exhaust ports 7 are. connected with a common header or manifold 12by the branch pipes'13. Some ot' these, for example the two from thecylinders 3 and 4, are provided With throttle valves 14 by means oliwhich the pipes can be entirely opened or closed or more or lessthrottled. The valves ymay be operated 'by a hand lever 15 connected 'byrods 16 with arms 17 on the valve spindles. The other cylinders, that isin the present instance the cylinders 1 and 2, are also provided Withvalves 19 for introdliicing compressed air for starting the engines. Allthe Working cylinders are provided with fuel injectors 18.

The operation is as follows: Compressed air is admitted to the Workingcylinders 1 and 2 by the-starting valves 19 at the proper intervals,while at the same time the exhaustor closed by Imeans of' the valves 14.The

compressed air in the cylinders l and 2,

Patented Jan'. 1e, 191'?.l

u pipes the cylinders 3 and 4 are throttled transmits its motion to thepistons in the cylinders 3 or 4, and also to the piston of the scavengerpump 10, and accelerates them uniformly. The air discharged by the pumpinto the receiver 9 rises in pressure during the periodof starting,Athereby also raising the compression temperature in the Workingcylinders to a vpoint above that attained dur-- ing normal running,because the scavengin air, which in quantity is sufficient for al fourcylinders, is now used only in two of them, 1 and 2, by reason of thethrottling of the exhaust from the other two, Sand 4. Consequently,only; partl of the air can escape, and the' remainder increasesinpressure and becomes'` highly heated.

IVhenever the scavenging ports of the cylinders 3 and 4 are opened,highly heated air .from the receiver enters said cylinders so that in ashort time a final. compression temperature attaned thereinsuflicientlyA high for '(aperation with fuel. It will be noted thatsince the exhausts of the two cylinders are throttlenil while starting,their contents are not rel'ilaced. on each successive cycle by air fromthe receiver, but that on successive strokes `the same air iscompressed, a little more air being added to it from the receiver,tlulsu'aising its initial pressure according to the pressure in-thereceiver. This air will be added since the receiver pressure will beslightly above the cylinder pressure at the time when the scavengingports open. As soon as tliese cylinders begin to fire, their exhaustsare opened, by tru-ning the valves 14, and coincidently therewith thesupply of compressed starting air is shut'o' by valves 1!) from thecylinders l and 2, and fuel is injected, either immediately or after afew where a spring 20 is interposed in the line of transmittingelements. A nut 21 enables the tension of the spring to be adjusted.

In acordancevvvith the provisions of the patent statutes, I havedescribed the princi- 'ple of operation, of my invention, together withthe apparatus which I now consider to represent the best embodimentthereof; but I desire tofhave it understood that the apparatus shown isonly illustrative, andthat the invention can be carried other means.

What I claim as new and ydesire tofseciir'e' by Letters Patent of ltheUnited States, isf-` 1. 'In an internal combustion en ne, the

- combination of a-pluralityof cylin ers fhav ing exhaust andscavengingportsya receiverk communicating with the scavenging ports,-fuel admission means, valveV means for supy plying starting air .to someof said cylinders,

'and means' for throttlingmor closing the exhausts of the other startingperiod..

2. In a 'highcompression internal com;

bustion engine, Vthe combination of a plurality of cylindersfhavingexhaust andscavenging ports, a common receiver communiyeating with thescavenging ports of al1 the cy1inders,a pump for supplying-,aiuto thereceiver, an exhaust manifold, pipes c on-` *theother cylinders... Inwitness'whereof, Ihave i my hand' this 18th lday'of January, 1915;

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lc zylinders during. the

v30 necting the exhaust ports'theretm-air starti ing valves connectedwlthv some of said 'cylrLinders, and shut-,01T valves'inthe ofr als 4

